QtWebEngine already detects a variety of places automatically: https://github.com/qt/qtwebengine/blob/v5.15.2/src/core/content_client_qt.cpp#L284-L389 https://

QtWebEngine already detects a variety of places automatically: https://github.com/qt/qtwebengine/blob/v5.15.2/src/core/content_client_qt.cpp#L284-L389 https://github.com/qt/qtwebengine/blob/v5.15.2/src/core/cont... So that flag is only needed if the file is in some strange place (like I'm guessing is the case on NixOS).